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Synthesis of sinusoidal oscillators with explicit-current-output using current feedback op-amps

WSEAS Transactions on Electronics 2006年第7期3卷 385-388页

作者： Gupta, S.S. Sharma, R.K. Bhaskar, D.R. Senani, R. Ministry of Commerce and Industry Government of India Udyog Bhawan New Delhi 110 011 India Department of Electronics and Communication Engineering Ambedkar Institute of Technology Delhi India Department of Electronics and Communication Engineering Faculty of Engineering and Technology Jamia Millia Islamia New Delhi 110 025 India Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology Azad Hind Fauj Marg Dwarka New Delhi 110 075 India

Although there have been numerous studies on synthesizing sinusoidal oscillators using current feedback op- amps (CFOAs), most of them have dealt with circuits providing a voltage-mode signal (from a low-output-impedance node). However, the problem of realizing Oscillators with explicit current output (from a high-output-impedance node) using commercially available CFOAs has rarely been explored in the technical literature. This paper addresses itself to this task, applies a systematic state-variable method for synthesizing such oscillators and reports three new circuits of this kind whose workability has been confirmed by experimental results using AD844 type CFOAs.

关键词： Operational amplifiers

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Power aware cluster efficient routing in wireless ad hoc networks 1

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7th International Workshop on Distributed Computing, IWDC 2005

作者： Dhurandher, Sanjay Kumar Singh, G.V. Division of Computer Engineering Netaji Subhas Institute of Technology New Delhi India School of Computer and Systems Sciences Jawaharlal Nehru University New Delhi India

ISBN: (数字)9783540324287

ISBN: (纸本)3540309594

In Ad Hoc networks a routing protocol is either proactive or reactive. The former maintains consistent up-to-date routing information from each node to every other node in the network, whereas the latter creates route to the destination only when desired by the source node using "flooding". In flooding packets are broadcast to all destinations with the expectation that they eventually reach their intended destination. This proves to be very costly in terms of the throughput efficiency and power consumption. For reactive protocols, researchers have tried to enhance the throughput efficiency and reduce power consumption using techniques that cut down flooding. In this paper we propose a routing protocol called Power Aware Cluster Efficient Routing (PACER) protocol for multi-hop wireless networks. In PACER, the network is dynamically organized into partitions called clusters with the objective of maintaining a relatively stable effective topology. The protocol uses the Weight Based Adaptive Clustering Algorithm (WBACA), developed by us for cluster formations. The main objective is to significantly reduce the number of overhead messages and the packet transfer delay. We demonstrate the efficiency of the proposed protocol with respect to average end-to-end delay, control overheads, throughput efficiency and the number of nodes involved in routing. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Telecommunication networks

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Power quality enhancement with DSTATCOM for small isolated alternator feeding distribution system

Power quality enhancement with DSTATCOM for small isolated a...

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Sixth International Conference on Power Electronics and Drive Systems, PEDS 200

作者： Singh, Bhim Adya, Alka Mittal, A.P. Gupta, J.R.P. Department of Electrical Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi Department of Instrumentation and Control Engineering Netaji Subhas Institute of Technology Delhi Dwarka New Delhi

ISBN: (纸本)0780392965

This paper focuses on power quality improvement with DSTATCOM on a small, isolated 42.5 kVA alternator feeding a three-phase, three-wire distribution system. Some power quality aspects like power-factor correction, voltage regulation and load balancing of linear load are discussed and implemented using DSTATCOM. DSTATCOM is realized using a three leg IGBT based PWM-VSI bridge having a DC bus capacitor. A hysteresis rule based carrier-less PWM current controller is used to derive gating pulses for the IGBT switches. The models are developed and simulated in MATLAB using Simulink and Power System Blockset (PSB) toolboxes. It is observed that DSTATCOM is effective in compensating reactive power and improving the power quality of the distribution system. © 2005 IEEE.

关键词： Synchronous generators

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Modeling and control of DSTATCOM for three-phase, four-wire distribution systems

Modeling and control of DSTATCOM for three-phase, four-wire ...

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2005 IEEE Industry Applications Conference, 40th IAS Annual Meeting

作者： Singh, Bhim Adya, A. Mittal, A.P. Gupta, J.R.P. Department of Electrical Engineering Indian Institute of Technology Hauz Khas New Delhi-110016 India Department of Instrumentation and Control Netaji Subhas Institute of Technology New Delhi-110045 India

ISBN: (纸本)0780392086

This paper deals with a DSTATCOM (Distribution Static Compensator) for load balancing, neutral current elimination, power factor correction and voltage regulation in three-phase, four-wire distribution system feeding commercial and domestic consumers. A four leg voltage source inverter (VSI) configuration with a dc bus capacitor is employed as DSTATCOM. The modified instantaneous reactive power theory (IRPT) is used in the control of DSTATCOM. The capability of the DSTATCOM is demonstrated through results obtained using MATLAB based developed model of the system at different types of loads. © 2005 IEEE.

关键词： Electric power distribution

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A safe and consistent game-theoretic controller for nonlinear systems

A safe and consistent game-theoretic controller for nonlinea...

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2nd Indian International Conference on Artificial Intelligence, IICAI 2005

作者： Sharma, Rajneesh Gopal, Madan Department of Electrical Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi-110016 India Netaji Subhas Institute of Teclmology Azad Hind Fauz Marg Dwarka New Delhi-110045 India

ISBN: (纸本)0972741216

The paper presents a novel algorithm based on game theory for optimizing controllers in presence of additive exogenous disturbances and parametric uncertainties of the controlled plant. The problem of controller design has been framed as a zero-sum Markov game between the controller and the disturber (disturbances). The proposed algorithm employs an 'annealed1 combination, of a variation of the 'cautious fictitious play' approach and the 'min-max5 solution methodology, for generating an optimal policy via a simple linear program. In Reinforcement Learning (RL) paradigm, controller optimization is done either in the Markov Decision Process (MDP) framework that assumes not only a stationary environment but is also inadequate for modeling noise and disturbances or the solution approach, which is computationally demanding and at times, even infeasible. The proposed approach generates a 'safe' and 'universally consistent' controller, by using a hybridization of the min-max strategy and a variation of cautious fictitious play. We empirically evaluate the approach on (i) Inverted Pendulum swing-up and, (ii) Non-holonomic Mobile Robot control tasks and compare its performance against standard O learning. Copyright © IICAI 2005.

关键词： Controllers

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Modeling and control of DSTATCOM for three-phase, four-wire distribution systems

Modeling and control of DSTATCOM for three-phase, four-wire ...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Bhim Singh A. Adya A.P. Mittal J.R.P. Gupta Department of Electrical Engineering Indian Institute of Technology New Delhi India Department of Instrumentation and Control Netaji Subhas Institute of Technology New Delhi India

This paper deals with a DSTATCOM (distribution static compensator) for load balancing, neutral current elimination, power factor correction and voltage regulation in three-phase, four-wire distribution system feeding commercial and domestic consumers. A four leg voltage source inverter (VSI) configuration with a DC bus capacitor is employed as DSTATCOM. The modified instantaneous reactive power theory (IRPT) is used in the control of DSTATCOM. The capability of the DSTATCOM is demonstrated through results obtained using MATLAB based developed model of the system at different types of loads.

关键词： Mathematical model Power system modeling STATCOM Load management Power factor correction Voltage control Leg Inverters Capacitors Reactive power control

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Power Quality Enhancement with DSTATCOM for Small Isolated Alternator feeding Distribution System

Power Quality Enhancement with DSTATCOM for Small Isolated A...

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International Conference on Power Electronics and Drive Systems (PEDS)

作者： B. Singh A. Adya A.P. Mittal J.R.P. Gupta Department of Electrical Engineering Indian Institute of Technology Delhi New Delhi India Department of Instrumentation and Control Engineering Netaji Subhas Institute of Technology New Delhi India

关键词： Power quality Alternators Pulse width modulation Insulated gate bipolar transistors Pulse power systems Power system modeling Power system simulation Voltage control Load management Leg

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A new approach for estimation of wavelets with non-separable kernel from a given image

A new approach for estimation of wavelets with non-separable...

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2004 International Conference on Signal Processing and Communications, SPCOM

作者： Gupta, Anubha Joshi, Shiv Dutt Prasad, Surendra Division of Computer Engineering Netaji Subhas Institute of Technology Dwarka Delhi India Electrical Engineering Department Indian Institute of Technology Delhi India

ISBN: (纸本)0780386744

In this paper, we propose a new approach for the estimation of wavelet with non-separable kernel from a given image. The paper discusses method to the design of biorthogonal 2D-FIR perfect reconstruction filter banks where the filters are estimated from a given image. The design method is proposed with different sampling lattices. The important contribution of this paper lies in the fact that these filters are estimated from given image itself. Several design examples are presented to show the efficacy of the approach and also the ease of design. Since these wavelets are estimated from given image, thus they are called 2-D matched wavelets. © 2004 IEEE.

关键词： Wavelet transforms

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A new approach for estimation of wavelets with non-separable kernel from a given image

A new approach for estimation of wavelets with non-separable...

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International Conference on Signal Processing and Communications, SPCOM

作者： A. Gupta S.D. Joshi S. Prasad Division of Computer Engineering Netaji Subhas Institute of Technology New Delhi India Electric Engineering Department Indian Institute of Technology New Delhi India

关键词： Kernel Lattices Filter bank Finite impulse response filter Wavelet analysis Image sampling Signal resolution Sampling methods Design methodology Signal design

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A wavelet based detection and analysis of gamma rhythms in EEG signals

A wavelet based detection and analysis of gamma rhythms in E...

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International Conference on Signal Processing and Communications, SPCOM

作者： G. Chawla A. Gupta S. Sengar STMicroelectronics Private Limited New Delhi India Division of Computer Engineering Netaji Subhas Institute of Technology New Delhi India Division of Electronics & Communication Engineering Netaji Subhas Institute of Technology New Delhi India

Until recently, it was assumed that there was no valuable signal above BETA range (13-30 Hz) in EEG signals. But studies have confirmed that there exist some frequencies above 30 Hz termed as Gamma rhythms. In this paper, a new method has been proposed to detect Gamma rhythms in wavelet domain. Further, the detected Gamma rhythms have been analyzed in terms of their energy contents during different activities in different regions of brain. These results have been shown over brain topography plots. It is observed that Gamma rhythms are present in varying concentration over different regions of brain during different activity of brain. Next, a composite analysis has been done to study the intensity of alpha, beta and gamma waves during different activities of the brain. This information may be useful in identifying sub-normal brain activity in different region. Thus, it can help a lot in diagnosing neural disorders and thus can be of great help in the area of telemedicine.

关键词： Wavelet analysis Gamma ray detection Gamma ray detectors Signal analysis Rhythm Electroencephalography Frequency Fourier transforms Wavelet transforms Humans

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